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How much heat is required to convert 0.3 kg of ice at 0°c to water at the same temperature

One day, after pulling down your window shade, you notice that sunlight is passing through a pinhole in the shade and making a small patch of light on the far wall. you see that the patch of light seems to be a circular diffraction pattern. it appears that the central maximum is about 1 cm across and you estimate that the distance from the window shade to the wall is about 3 m. what is (a) the average wavelength of sunlight? (b) the diameter of the pinhole?

What is the acceleration of a spaceship that is initially at rest and then speeds up to 220 m/s in 20 seconds